I've got experience with the DX7, 9303, and one you really might want to look at, the JR7202.

The DX7 and 7202 are actually almost the same radios. I've got a student who has both. No fooling. He got one for Christmas and one for his birthday. Truth is, his most valuable possession is his wife, who gave them both to him. whatever....

His 7202 is a synthesizer one. So the guy is rolling in tech.

For the next year or so, he figures he'll be using the 7202 almost exclusively. He likes both but the DX7 is limited to using the special receivers those need. And he couldn't even buy one back when he got his 2nd airplane (backup trainer). And then he found out what they cost. So he's using the 7202 and any RX he wants to.

Turns out the 7202 is no trouble to use and the synthesizer capability avoids conflicts with frequencies. Yeah, it's hittable, but that's actually not much probability, if any with our bunch.

And since the 7202 and DX7 provide almost exactly the same future growth for you, it'd be worth looking at.

I'd go with the 7202 if you I were you. I like to use the ability to have more than one airplane and all that I have in one TX. And I can do that with either, but the RXs to work with the 7202's can cost as little as $25. Most I fly now are $50. So I'm building a Corsair, and just finished a Tiger60 and both RX cost less than one would have for the DX7. Just something to consider.